Add the 1/3 cup granulated sugar and zest from 1 lemon to a medium bowl. Use a spoon mix the two together until slightly moist and fragrant.
Add the 2 ½ cups all-purpose flour, spooned and leveled, 1 Tablespoon + 1 teaspoon baking powder, ½ teaspoon salt and 1 Tablespoon poppy seeds to the lemony-sugar and whisk until combined.
In a separate, medium bowl, combine the 2 cups buttermilk, 2 Tablespoons melted butter and 1 teaspoon vanilla extract.
Add the wet ingredients to the dry ingredients and stir until combined. The batter will be wet and sticky. Do not overmix.
Place 1/2 cup (1 stick) salted butter into the bottom of an 8x8 or 9x9-inch baking dish (I prefer a Pyrex or ceramic dish, if possible)
Microwave the butter until it melts. (I use the melt setting on my microwave so that the butter doesn’t explode. If you don’t have this setting, I recommend using your oven to gently melt the butter in the pan instead.)
Pour the biscuit batter into the pan with the melted butter. Gently spread the batter to the edges of the pan.
Use a knife to loosely score the biscuits into 9 squares. This will make it easier to cut the biscuits when they are done baking.
Bake on the middle oven rack for 25-30 minutes, or until the top and sides are golden brown. Baking times can vary so go by doneness, not just by time. If you find your biscuits are browning too quickly, place a sheet of foil over the top for the remaining baking time.
Add the 1 cup powdered sugar, 2 Tablespoons fresh lemon juice, ¼ teaspoon almond extract, pinch of salt and 2 teaspoons poppy seeds to a bowl and stir until smooth.
Pour and spread over the biscuits. Then serve!
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.
The buttermilk will cut a bit of the sweetness. If you want this to have a sweeter taste, use heavy c ream instead of buttermilk.